@article{ASNSP_1985_4_12_1_105_0,
     author = {Viola, Carlo},
     title = {On {Dyson's} lemma},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {105--135},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 12},
     number = {1},
     year = {1985},
     mrnumber = {818804},
     zbl = {0596.10032},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1985_4_12_1_105_0/}
}